Remove joins from token transfers' query

Once we have the block_number denormalized in the token transfer's
table, the query doesn't need to join with transaction and block
anymore.

apps/block_scout_web/lib/block_scout_web/templates/tokens/transfer/_token_transfer.html.eex

@@ -43,7 +43,7 @@
           <%= link(
             gettext(
               "Block #%{number}",
-              number: @transfer.transaction.block_number
+              number: @transfer.block_number
             ),
             class: "mr-2 mr-sm-0 text-muted",
             to: block_path(BlockScoutWeb.Endpoint, :show, @transfer.transaction.block_number)

apps/explorer/lib/explorer/chain/token_transfer.ex

@@ -26,7 +26,7 @@ defmodule Explorer.Chain.TokenTransfer do
 
   import Ecto.{Changeset, Query}
 
-  alias Explorer.Chain.{Address, Block, Hash, Token, TokenTransfer, Transaction}
+  alias Explorer.Chain.{Address, Hash, Token, TokenTransfer, Transaction}
   alias Explorer.{PagingOptions, Repo}
 
   @default_paging_options %PagingOptions{page_size: 50}
@@ -121,13 +121,9 @@ defmodule Explorer.Chain.TokenTransfer do
     query =
       from(
         tt in TokenTransfer,
-        join: t in Transaction,
-        on: tt.transaction_hash == t.hash,
-        join: b in Block,
-        on: t.block_hash == b.hash,
         where: tt.token_contract_address_hash == ^token_address_hash,
         preload: [{:transaction, :block}, :token, :from_address, :to_address],
-        order_by: [desc: b.timestamp]
+        order_by: [desc: tt.block_number]
       )
 
     query